SAD IRONY: John Littig and wife Lynne Rosen, of the radio show “The Pursuit of Happiness,” killed themselves together in their Brooklyn home. Photo:

(Stefan Jeremiah)

SAD IRONY: John Littig and wife Lynne Rosen, of the radio show “The Pursuit of Happiness,” killed themselves together in their Brooklyn home. (
)

Outside their Brooklyn home (Stefan Jeremiah)

They were the ones who needed help.

A Brooklyn couple who hosted a self-help radio show committed suicide by suffocating themselves with helium and plastic bags — leaving behind tragic suicide notes detailing a battle with bipolar disorder, police sources and witnesses said.

Psychotherapist Lynne Rosen, 46, and her motivational-speaker husband John Littig, 48 — who appeared on WBAI-FM’s “The Pursuit of Happiness”— rigged tubes to a helium tank then tied plastic bags around their heads at their Park Slope home, the sources said.

“I can’t take it anymore, my wife is so sick. She’s in too much pain. Please bury us together,” Littig wrote, according to a building manager who discovered the couple dead.

Rosen’s note proclaimed she loved her husband — but couldn’t go on living.

Building manager Hasan Boztepe, 51, found the couple on a living-room couch Monday morning — after neighbors complained about a foul smell coming from the home on President Street and Eighth Avenue.

Boztepe first knocked, then broke down the door.

“It was very, very bad,” Boztepe said. “They were sitting on the couch holding hands together. The bodies were black and very swollen.